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MISCELLANEOUS
RESIDENTIAL DUAL
CHECK VALVE
BACKFLOW PREVENTERS
Provides backflow protection by containment
at the water meter. The Dual Check is a
versatile backflow preventer. It operates
efficiently in the horizontal or vertical position
& under intermittent or continuous pressure.
Tested & certified to meet or exceed the 1988
revision of ANSI/ASSE St. 1024. CSA certified
to Std. No. B64.6.
Locke#
M1022
#7 - ¾" Dual Check Backflow
Preventer
M1023
#7 - 1" Dual Check Backflow
Preventer
DOUBLE CHECK
ASSEMBLY
Locke#
M1006
LF007QT ½" Double Check
M1010
007QT ¾" Double Check
M1011
007QT 1" Double Check
STRAINER KITS FRO
BACKFLOW PREVENTERS
Protects backflow preventers from foreign
debris. Includes wye strainer & nipple.
Locke#
M1030
½" Wye Strainer Kit with Nipple
M1031
¾" Wye Strainer Kit with Nipple
M1032
1" Wye Strainer Kit with Nipple
M1033
1¼" Wye Strainer Kit with Nipple
M1034
1½" Wye Strainer Kit with Nipple
M1035
2" Wye Strainer Kit with Nipple
SWING CHECK VALVE
Pipe thread - 125 lb. pressure for water, oil or
air, up to 210 F. Brass main use is to prevent
backflow of fluids.
Locke#
M0514
½" Swing Check Valve IPS
M0515
¾" Swing Check Valve IPS
M0516
1" Swing Check Valve IPS
M0517
1¼" Swing Check Valve IPS
M0518
1½" Swing Check Valve IPS
M0519
2" Swing Check Valve IPS
BACKFLOW PREVENTER
FOR VENDING MACHINE
WATER LINES &
CARBONATED BEVERAGE
(REQUIRED BY CODE)
M1013
M1012
M1019
No. 9D is for protection against backflow of
carbon dioxide gas & carbonated water into
the water supply system to vending machines
thus eliminating the hazardous reaction of
carbon dioxide with copper tubing.
Locke#
M1019
9D
½" FIP Backflow
Preventer with Intermediate
Atmosphere Vent- Max. Pressure
175 PSI
M1012
SD2-MF
a
" Faucet Vented Dual
check backflow preventer; Meets
ASSE Std. 1032 & Std. 1022, NSF-
18
M1013
SD3-MF
a
" Faucet Vented Dual
check backflow preventer with
strainer; Meets ASSE Std. 1022,
NSF-18
CHECK VALVES & BACKFLOW PREVENTERS